Space analyzing, Arbitrary map output, Section analyzing.

空间分析； 任意图幅的地图输出；

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These two parameters decide where to put data in Hadoop, in which mapred.local.dir decides where MapReduce intermediate data (map output data) is stored, and dfs.data.dir.

这两个参数决定把Hadoop中的数据放在什么地方，mapred . local . dir决定存储MapReduce中间数据(map输出数据)的位置，dfs . data . dir决定存储HD fs数据的位置。

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According to experience, the effect of increasing this value is kind of slight, and the suggestion is to increase this value only if the map output is very large in your job.

根据个人经验，增加这个值的效果不太明显，建议只在map输出非常大的情况下增加这个值。

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The output areas form blocks, which can be coded and drawn onto a simplified modern street map after some smoothing of edges.

ECONOMIST: How Charles Booth��s map of Chelsea has been updated